| Year | Value | | 2022 | 16,516,168 | | 2021 | 15,843,332 | | 2020 | 15,126,432 | | 2019 | 14,308,280 | | 2018 | 13,627,478 | | 2017 | 13,132,435 | | 2016 | 12,679,852 | | 2015 | 12,272,386 | | 2014 | 11,916,863 | | 2013 | 11,613,834 | | 2012 | 11,351,885 | | 2011 | 11,105,230 | | 2010 | 10,854,402 | | 2009 | 10,596,263 | | 2008 | 10,328,954 | | 2007 | 10,055,781 | | 2006 | 9,793,578 | | 2005 | 9,552,573 | | 2004 | 9,326,354 | | 2003 | 9,104,773 | | 2002 | 8,883,666 | | 2001 | 8,657,887 | | 2000 | 8,425,771 | | 1999 | 8,184,650 | | 1998 | 7,938,759 | | 1997 | 7,698,336 | | 1996 | 7,469,346 | | 1995 | 7,254,279 | | 1994 | 7,053,185 | | 1993 | 6,866,430 | | 1992 | 6,693,601 | | 1991 | 6,532,644 | | 1990 | 6,380,036 | | 1989 | 6,233,411 | | 1988 | 6,090,644 | | 1987 | 5,952,249 | | 1986 | 5,823,562 | | 1985 | 5,707,575 | | 1984 | 5,603,142 | | 1983 | 5,510,659 | | 1982 | 5,423,932 | | 1981 | 5,328,493 | | 1980 | 5,212,415 | | 1979 | 5,073,378 | | 1978 | 4,909,861 | | 1977 | 4,729,045 | | 1976 | 4,553,798 | | 1975 | 4,400,115 | | 1974 | 4,271,001 | | 1973 | 4,171,561 | | 1972 | 4,094,242 | | 1971 | 4,028,471 | | 1970 | 3,939,794 | | 1969 | 3,808,623 | | 1968 | 3,643,432 | | 1967 | 3,458,392 | | 1966 | 3,288,863 | | 1965 | 3,158,939 | | 1964 | 3,069,847 | | 1963 | 3,026,130 | | 1962 | 3,020,219 | | 1961 | 3,009,154 | | 1960 | 2,959,697 |
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